1678405922 has 18 divisors (see below), whose sum is σ = 2566229979. Its totient is φ = 823298980.

The previous prime is 1678405901. The next prime is 1678405931. The reversal of 1678405922 is 2295048761.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 839202961 + 839202961 = 28969^2 + 28969^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=28969.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3418097 + ... + 3418587.

Almost surely, 2^1678405922 is an apocalyptic number.

1678405922 is a deficient number, since it is larger than the sum of its proper divisors (887824057).

1678405922 is an frugal number, since it uses more digits than its factorization.

1678405922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102 (or 552 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 1678405922 is about 40968.3526883862. The cubic root of 1678405922 is about 1188.4082765198.

The spelling of 1678405922 in words is "one billion, six hundred seventy-eight million, four hundred five thousand, nine hundred twenty-two".